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  <title>iPhone 12</title>
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<body>
  <header class="header">
    <h1>iPhone 12</h1>
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  <section class="section">
    特点
  </section>
  <section class="section">
    参数
  </section>
  <section class="section">
    规格
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  <script src="https://unpkg.com/jquery"></script>
</body>
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